Seems that in the Finnish language the sign is suppose to be named "Kyltti" but instead named "Allekirjoita". No one is to be blamed as sign does mean two obvious things. A sign is a wooden... sign. and the other one is like signing a book. Please fix this error. Thank you!
MC-130618
The sign has a wrong name
Resolved
Invalid
0
Translation issues are handled at https://crowdin.com/project/minecraft
The Sign-Issue is well known, will fix that there.